Revert r21117 as it caused reliability failures....

chrome/worker/worker_thread.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_WORKER_WORKER_THREAD_H_
 #define CHROME_WORKER_WORKER_THREAD_H_
 
+#include "base/thread.h"
 #include "chrome/common/child_thread.h"
 
 class GURL;
 class WorkerWebKitClientImpl;
 
 class WorkerThread : public ChildThread {
  public:
   WorkerThread();
   ~WorkerThread();
 
   // Returns the one worker thread.
   static WorkerThread* current();
 
  private:
   virtual void OnControlMessageReceived(const IPC::Message& msg);
 
+  // Called by the thread base class
+  virtual void Init();
+  virtual void CleanUp();
+
   void OnCreateWorker(const GURL& url, int route_id);
 
   scoped_ptr<WorkerWebKitClientImpl> webkit_client_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkerThread);
 };
 
 #endif  // CHROME_WORKER_WORKER_THREAD_H_